Being able to import a complex component from a Spice model and apply it to the relevant symbol (i.e. a Spice model for the TIP122 and apply it to the basic "NPN" symbol) would be amazing.

The ease of usability of iCircuit is its most attractive feature over "bigger" products like LTSpice, but not being able to fine tune components (i.e. only being able to set hFE on transistors, not being able to use a wave file as an input, or record the circuit behaviour to a wave file) is the only thing that is stopping me from paying for a Pro license.